So I've had my H11 with the Philips Bulb 4300k since June 2016, and I've noticed that the color temperature has since shifted to be more yellow compared when new. I know after some use the bulbs tend to shift color, so just seeing what everyone else's experience is. The vehicle rarely gets driven at night, so there's very little hours on the bulbs themselves.
Also I've noticed recently that the bulbs warm up differently, where one side goes from blue to yellowish/white immediately, but the other takes a bit. Looks kind of weird when I'm driving down the road with 2 different colored headlights for a few minutes.
Mine are still fairly new - only had for about 4-5 months. But my experience is that when they first turn on, they are very white with a blueish hue, but quickly become yellow with a green tint around the cutoff line. I wish they looked like they did when they first turn on all the time. Don't really care for the yellow and greenish hue.